Glass-drawing device



April 29, 1924.

H, E. DE VAUGHN GLAS S DRAWING DEVICE Filed July 13 1923 gmwm Patented Apr. 29, 1924.

UNITED STATES PATENT OFFICE.

HARRY E. DE VAUGHN, OF MORGANTOWN, WEST VIRGINIA, ASSIGNOR TO UNITED STATES WINDOW GLASS COMPANY, A. CORPORATION OF WEST VIRGINIA.

GLASS-DRAWING DEVICE.

Application filed July 13,

To all whom it may concern:

Be it known that I, HARRY E. DE VAUGHN,

a citizen of the United States, residing at Morgantown, in the county of Monongalia l and State of West Virginia, have invented a new and useful Glass-Drawing Device, of

which the following is a specification.

This invention is a bait for drawing window glass cylinders by the machine method,

and consists of a modification of the device disclosed in my copending application Ser.

No. 651,309, filed July 13, 1923.

In the practice of drawing window glass cylinders from molten glass by the machine ll method, the cylinder, while being drawn,

frequently moves out of its normal, concentric position with respect to the point of draw, the direction of movement being more or less uncertain. One of the effects of such U movement is to upset those conditions, which normally insure that the cylinder wall will be of approximately uniform thickness, and to cause thick or thin streaks, or both, to form in said wall. The causes of this tendency of the cylinder to travel while being drawn are not clearly understood, but it has been asserted that the surface tension of the molten glass is more or less a factor.

Heretofore it has been proposed to over- 80 come the tendency of the cylinder to travel, and the consequent tendency to form the thick and thin streaks in the cylinder wall, by adjusting the point of draw relative to the wall of the pot or receptacle, containing the molten glass. Such adjustment is made on the theory that a shift in the position of the bait with respect to the point of draw, will compensate for the expected travel of the cylinder upon the glass bath, and thereby insure more perfect uniformity in thickness of the cylinder wall. This method, while successful to a degree, is somewhat uncertain in practice, because there is no fixed or definite basis upon which the adjustment may be made, and in consequence it is a more or less empirical or rule of thumb method.

One of the objects of the invention is to provide a bait having a universal joint connection with the bait-stem, whereby the gravity inherent in a freely movable suspended bait, may be utilized to counteract the tendency of the cylinder to travel over the surface of the bath during the drawing operation. A further object is to provide a 1923. Serial No. 651,308.

joint connection of the character mentioned, so constructed that the parts may be readily separated or assembled as occasion may require.

The invention will be hereinafter fully set forth and claims.

In the accompanying drawing Figure 1 is a front elevation conventionally illustrating a glass drawing apparatus. Figure 2 is a vertical sectional view illustrating a bait and bait-stem constructed in accordance with the invention. Figure 3 is a similar view illustrating a slight modification.

Referring to the drawing, 10 desi ates a bait, the upper portion of which is o frustoconical shape, and is provided with a central opening 11. The lower portion of the bait is provided with the glass engaging lip 13. It will be noted that the bait illustrated is of the cold-bait type, which has been selected merely for illustrative purposes, and it is to be understood that the invention is not in any way limited thereto.

The upper portion of the bait, contiguous to the opening 11, is concaved as indicated at 14, to provide. a socket-like seat for a complemental approximately spherical enlargeparticularly pointed out in the ment 15, formed on one end of a coupling member 16, which is extended through the opening 11. Said coupling member is connected with the lower end 17 of a bait-stem 18, by means of a threaded coupling sleeve 19. The socket member and baitstem are provided with threads complemental to said sleeve.

In practice, the coupling member 16 is passed through the opening 11 from the inside of the bait, and coupled to the baitstem 18 by means of the sleeve 19. In this manner the bait is supported so as to freely swing upon the spherical enlargement 15.

In the form illustrated in Figure 2, the sleeve 19 in addition to its coupling functions, serves to limit longitudinal movement of the bait-stem 18, thereby preventing it from slipping through the bait head when the device is not in use. In the form illustrated in Figure 3, the coupling member 16, is somewhat longer than the coupling member 16 of Figure '2. By this arrangement space is provided for the rece tion of a nut 20, working upon the threa ed portion of the coupling member 16, said nut being inter-- CPL,

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' that such claims posed between the sleeve 19 and the bait and acting as a stop to prevent the pipe from falling through when the bait is not in. use.

In operation, the bait-stem is rigidly suspended from the usual cage A, of the glass drawing apparatus, in a well-known manner, leaving the bait free to move in any direction on the universal joint formed by the enlargement 15 and the socket portion 14. By so suspending the bait the force of gravity tends to retain it in a normal central position. As the cylinder is being drawn, any tendency of the cylinder to travel over the surface of the bath during the drawing operation, is counteracted by the weight of the bait itself, the inherent gravity thereof tending to retain it in its normal central position. However, if the bait itself is not normally of suflicient weight to counteract the travelling tendency of the cylinder, additional weight may be provided by thickening the walls or in any other suitable manner.

From the foregoing, it will be readily understood that by the method disclosed, any tendency of the cylinder to travel over the surface of the bath is automatically overcome, and the cylinder throughout the draw is maintained in concentric relation with the axis from which the draw started. In this way the formation of thick or thin glass is prevented, and the walls oi? the cylinder are maintained of approximately uniform thickness. An important advantage is that the bait and the bait-stem may be readily connected or disconnected, for the purposes of repair, or for substitution or" new parts as the case may be.

No attempt is made herein to claim the broad invention involved for the reason are included in a copending application filed July 13, 1923, S81. No. (351,309, in which application is disclosed a device differing somewhat in structure but designed to accomplish the same results.

Having thus explained the nature oi the invention and described an operative manher of constructing and using the same,

although without attempting to set forth all or the forms in which it may be made, or all oil: the forms of its use, what is claimed is 1.. A glass drawing device of the character described comprising a bait-stem, a bait having an opening in its top, and coupling means extending; through said opening and engaging said bait-stem, said coupling means loosely engaging and supporting said bait.

A glass drawing device of the character described comprising a bait-stem, a bait having an opening in its top, and cou pling means extending through said opening and engaging said bait-stem, said bait and said coupling means having oomplemental portions providing a'universal joint.

masses 3. A glass drawing device of the character described comprising a bait-stem, a hollow bait having an opening in its top, and a coupling member passed through said opening and engaging said bait-stem, said coupling member having a spherical en.- lare'ement, said bait having an internal recessed portion compleiuental to said enlargement.

4. A glass drawing device of the character described comprising a bait-stem, a bait having an opening in its top, coupling means extending through said opening and engaging said bait-stem. said coupling means loosely engaging and supporting said bait, and means For limiting longitudinal movement oi. the bait-stein relative to the bait.

glass drawing device of the charactcr described comprising a bait-stem, a hollow bait having an opening in its top. a coupling member passed through said opening; and "engaging said bait-stem, said coupling member having a spherical enlargement, said bait having an internal rece .ed portion complemental to said enlarge ment, and means for limiting longitudinal n'iovement oit'the bai l1-stem relative to the bait.

6. 1; glass drawing device of the character described con'iprising a bait-stem, a

bait having an opening in its top, coupling means extending through said opening and. engaging said bait-stem. said coupling means loosely engagin2 and supporting said bait. and an adjustable stop member engaging the coupling member and positioned to overhang the bait.

7. ll. glass drawing device of the character described comprising a bait-ste1n, a spherical member removablv secured thereto, and a bait having an internal portion complemental to said spherical member.

8. A glass drawing device of the character described comprising bait-stem, a spherical member. a sleeve detachably connecting said bait-stem and said spherical member, and a bait having an internal chamber complemental to said spherical. member. 7

9. A glass drawing device of the char acter described comprising a bait-stem, a spherical member removably secured thereto, a bait having an internal portion complemental to said spherical member, and a stop limitinglongitudinal movement of the bait-stem with respect to the bait.

10. A glass drawing device of the character described comprising a bait-stem, a spherical member, a sleeve detachably connecting" said spherical member, a bait having an internal chamber complemental to said spherical member, and'a nut interposed between said sleeve and the top of the bait.

in testimony whereof l have hereunto set my hand.

VAUGHN. 

